I think everyone will have a favorite brand, but I don’t think there is anything that is warmer than the Striker Climate Suit. The length is adjustable by folding the bottom up and snapping it into place, and mine have never come undone. It also has removable insulation for warmer days.
I do not own, nor have I tried the Eskimo float suits, but I am impressed with their price point. Hopefully someone can comment on their impressions there but if I were to buy one today that is where I would look just to save a couple hundred dollars.